Effect of different metal surface treatments and thermocycling on shear bond strength of heat cure and light cure at Co/Cr and Ni/Cr interface
Main Article Content
Abstract
Background Optimum bond strength at the metal – resin interface of prosthesis is essential for the success of that
prosthesis. The junction between metal alloy and acrylic resin is an area of clinical concern .Failure of a R.P.D. may
be linked to this interface. The main objective of this study were to determine the effect of different metal surface
treatment and thermocycling on the shear bond strength of Co/Cr alloy and Ni/Cr alloy to heat cure acrylic resin
and light cure acrylic resin.
Materials and methods: 120 metal samples were prepared, 60 Co/Cr samples and 60 Ni/Cr of square flat plate (30
mm x 30mm x 2 mm) that incorporated a central area (8mmx 12mm) of a large retentive mesh to simulate denture
framework. The samples were cleaned, finished and electropolished. Sixty samples of each type of metals were
divided into two groups according to the type of acrylic resin received each one 30 samples (A and group C) for
heat cure, B and group D for light cure) which were furtherly subdivided according to the type of surface treatment
into 3 subgroups each one 10 samples(A1 ,B1 ,C1and D1 )for no surface treatment, no thermocycling as a control
group (A2, B2 ,C2 and D2 )for Metal Prime II application with thermocycling (A3, B3 ,C3 and D3) for combination of
Air Abrasion and Metal Primer II application with thermocycling. The acrylic block were then prepared as a
rectangular block(12mm length ,8 mm width ,6 mm high )that was placed on a central area of metal plates, the
acrylic was fabricated in the same conventional way of denture construction. All the sample were mounted on
specially test fixture that would hold them rigid at a 90-degree angle from the horizontal plane of the crosshead of
the Instron machine .A tangent shear force was created by applying vertical load to the specimen .All of the
specimen were tested with Instron machine using stainless steel chisel shaped road at a constant crosshead speed of
5 mm min until failure of the bond occurred The specimen were stressed to failure .The force of bond failure was
recorded in Newton, which was divide by the surface of the bonded area (96 mm2 )to obtain the shear bond
strength calculated in Mpa.
Result: The results showed that the subgroup that received no surface treatment and without thermocycling for both
two type of resins heat cure and light cure (A1, B1, C1and D1) had the highest shear bond values, followed by
subgroups that received Air Abrasion + Metal Primer II surface treatments and thermocycling (A3, B3, C3,
D3).Subgroups that received Metal Primer II alone (A2, B2, C2 and D2) showed the least shear bond value than the
other subgroups.
Conclusion: All metal samples of Co/Cr and Ni/Cr with heat cure acrylic resin showed higher SBS mean values than
that light cure resin whether with surface treatment and thermocycling or without thermocycling concluded higher
binding of heat cure acrylic resin with the metal surface
prosthesis. The junction between metal alloy and acrylic resin is an area of clinical concern .Failure of a R.P.D. may
be linked to this interface. The main objective of this study were to determine the effect of different metal surface
treatment and thermocycling on the shear bond strength of Co/Cr alloy and Ni/Cr alloy to heat cure acrylic resin
and light cure acrylic resin.
Materials and methods: 120 metal samples were prepared, 60 Co/Cr samples and 60 Ni/Cr of square flat plate (30
mm x 30mm x 2 mm) that incorporated a central area (8mmx 12mm) of a large retentive mesh to simulate denture
framework. The samples were cleaned, finished and electropolished. Sixty samples of each type of metals were
divided into two groups according to the type of acrylic resin received each one 30 samples (A and group C) for
heat cure, B and group D for light cure) which were furtherly subdivided according to the type of surface treatment
into 3 subgroups each one 10 samples(A1 ,B1 ,C1and D1 )for no surface treatment, no thermocycling as a control
group (A2, B2 ,C2 and D2 )for Metal Prime II application with thermocycling (A3, B3 ,C3 and D3) for combination of
Air Abrasion and Metal Primer II application with thermocycling. The acrylic block were then prepared as a
rectangular block(12mm length ,8 mm width ,6 mm high )that was placed on a central area of metal plates, the
acrylic was fabricated in the same conventional way of denture construction. All the sample were mounted on
specially test fixture that would hold them rigid at a 90-degree angle from the horizontal plane of the crosshead of
the Instron machine .A tangent shear force was created by applying vertical load to the specimen .All of the
specimen were tested with Instron machine using stainless steel chisel shaped road at a constant crosshead speed of
5 mm min until failure of the bond occurred The specimen were stressed to failure .The force of bond failure was
recorded in Newton, which was divide by the surface of the bonded area (96 mm2 )to obtain the shear bond
strength calculated in Mpa.
Result: The results showed that the subgroup that received no surface treatment and without thermocycling for both
two type of resins heat cure and light cure (A1, B1, C1and D1) had the highest shear bond values, followed by
subgroups that received Air Abrasion + Metal Primer II surface treatments and thermocycling (A3, B3, C3,
D3).Subgroups that received Metal Primer II alone (A2, B2, C2 and D2) showed the least shear bond value than the
other subgroups.
Conclusion: All metal samples of Co/Cr and Ni/Cr with heat cure acrylic resin showed higher SBS mean values than
that light cure resin whether with surface treatment and thermocycling or without thermocycling concluded higher
binding of heat cure acrylic resin with the metal surface
Article Details
How to Cite
Khursheed, A. and Mohammed, S. (1) “Effect of different metal surface treatments and
thermocycling on shear bond strength of heat cure and
light cure at Co/Cr and Ni/Cr interface”, Journal of Baghdad College of Dentistry, 24(2), pp. 1-5. Available at: http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/1258 (Accessed: 29November2019).
Issue
Section
Restorative Dentistry
Licenses and Copyright
The following policy applies in The Journal of Baghdad College of Dentistry (JBCD):
- JBCD applies the Creative Commons Attribution (CC BY) license to articles and other works we publish. If you submit your paper for publication by JBCD, you agree to have the CC BY license applied to your work. Under this Open Access license, you as the author agree that anyone can reuse your article in whole or part for any purpose, for free, even for commercial purposes. Anyone may copy, distribute, or reuse the content as long as the author and original source are properly cited. This facilitates freedom in re-use and also ensures that JBCD content can be mined without barriers for the needs of research.
- If you have written permission to do so, yes. If your manuscript contains content such as photos, images, figures, tables, audio files, videos, etc., that you or your co-authors do not own, we will require you to provide us with proof that the owner of that content (a) has given you written permission to use it, and (b) has approved of the CC BY license being applied to their content. We provide a form you can use to ask for and obtain permission from the owner. If you do not have owner permission, we will ask you to remove that content and/or replace it with other content that you own or have such permission to use.Don't assume that you can use any content you find on the Internet, or that the content is fair game just because it isn't clear who the owner is or what license applies. It's up to you to ascertain what rights you have—if any—to use that content.
- Many authors assume that if they previously published a paper through another publisher, they own the rights to that content and they can freely use that content in their PLOS paper, but that’s not necessarily the case – it depends on the license that covers the other paper. Some publishers allow free and unrestricted re-use of article content they own, such as under the CC BY license. Other publishers use licenses that allow re-use only if the same license is applied by the person or publisher re-using the content. If the paper was published under a CC BY license or another license that allows free and unrestricted use, you may use the content in your JBCD paper provided that you give proper attribution, as explained above.If the content was published under a more restrictive license, you must ascertain what rights you have under that license. At a minimum, review the license to make sure you can use the content. Contact that JBCD if you have any questions about the license. If the license does not permit you to use the content in a paper that will be covered by an unrestricted license, you must obtain written permission from the publisher to use the content in your JBCD paper. Please do not include any content in your JBCD paper which you do not have rights to use, and always give proper attribution.
- If any relevant accompanying data is submitted to repositories with stated licensing policies, the policies should not be more restrictive than CC BY.
- JBCD reserves the right to remove any photos, captures, images, figures, tables, illustrations, audio and video files, and the like, from any paper, whether before or after publication, if we have reason to believe that the content was included in your paper without permission from the owner of the content.